Telephone attachment.



W. G. FISE a H. L. WHITE.

n TELEPHONE ATTACHMENT.

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WILLVARD FISK AND HARRY WHITE, F OROIE'INQ` IDAHO.

To all whom 'it 'muy cancun.

Be it known that we, lliLLAuD C. Fisii and HARRY L. lViii'rE, citizens of the lnited States, residing at Oroino, in the. county ot' Nez Perce, State of Idaho, have invented certain new and useful Improvements` in Telephone Attachments; and `we do hereby declare the followin to be a full. clear, and exact description o.. the invent-ion, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to telephone attachments of that general class designed for vdetecting unauthorized auditors on party mes.

The principal object of this invention is to rovide Ya device of this character that wil automatically telegraph the call of n telephone being used to intercept conversation, to the parties engaged in the conversation.

A further object. is to provide an audible Vsignal that theintruder will be powerless to suppress after having removed his receiver from the hook. y

Vt ith the above and other objects in view,

i the invention consists in general, of a simple device in the nature of an interrupter connected in parallel with the primary eircuitJ and arranged to produce a series o f clicks that correspond to the call of the telephone.

. In the accompanying drawing. forming part ofthis specification. Figure l is a front elevation of a telephone equipped with :in

attachment constructed in accordance with our invention, with parts of the casing re;

moved to expose the interior. Fig. 2 is a section on the liuc 2*-2, Fig. 1. Fig. 3 is a section on the line 3-3, Fig. 1. Fig. -l is a detail perspective view of the iuterrupter disk.

The reference numeral S designates a telephone of the wall or box type having a i'eceiver 9 and a transmitter l0 of the usual and well-known kind.

The telephone attachment comprising the subject matter of this invention consists of :i casing 11 adapted to `he rigidly secured to the top wall of the telephone S. Mounted upon the receiverheult 1Q is iinV extensible rod designated in general by the numeral 13. this' yrod being provided at one end with a clamp 14 which encireles thc receiver hook and is secured tl'iorcto byffa set, screw l5. The free endkof the rod extends upwardly through TELEPHONE ATTACHMENT.

n Specification of Letters Patent.. lPatented Get. 18, 1910.

Application filed April 14. `157310. Serial N0. 555,343. l

l registering openings in the opposed walls o f i the casing and telephone into the casing 11, and is curved outwardly at. its free extremity 1G. This curved terminal 16 bears against a transversely disposed step 1l' mounted rod laterally when the receiver hook 12 is raised: A leaf spring 18 bears against the rear side of the rod 13 and operates to retlie receiver hook is depressed by the receiver. Formed on the rod a short distance below its curved extremity is a ledge or shoulder 19 the purpose of which will presentlj.' appear.

Rising from the bottom of the casing 11 is Loosely mounted on the stub shaft is a ratchet disk 2 to the outer side face of which v is rigidly secured one end of a link 23 which latter is sufliciciit. in length to engage :it its free end the shoulder 15) of the rod ..vlieu the latter is at rest in its lowest liin'it of cured to the stub shaft 21 is a gear 24 which is considerably greater in diameter than the ratchet and' is provided im its inner side face with a spring pressed pawl 25 which engages the ratchet. It is now evident-'that hook the latter will raise and. move upward the rod lil which latter is caniuied outwardly h v the stop t7 thereb)l permitting the link :23 to become disengaged fron-i the shoulder lt). A helical spring 26 secured to the bottom of the casing engages the free cud of the link 23 and operates to pull downward the link after the latter has hecoine disengaged from the shoulder. this downward movement. of the link serving to rotate the ratchet backwardly. and since the gear 24 is locked by means of the pawl to the ratchet. this gear will rotate siuuiltaneouslv with the ratchet and in the saine direction as the latter. As before stated. the rati-het is loosely mounted on the stub shaft. 2l so that when the ratchet is rotated forwardly through the instrumentality of the link 23'when the rod i3 rises, the pawl 25 will slide freely over the periphery of the ratchet and not lock the gear and pawl together so that the gear is at rest. during the rising movement ofthe rod.

Rising 'from the bottoni of the easing 11 Y is :i pair of spaced standards?? having snitiible bearings at their upper ends to receive within the casing and operates to move the.

a standard 29 having at its upper end a suitable hearing to receive a stub shaft zh' movement. Keyed or otherwise rigidly se,

when the receiver is 'taken from the receiver,

turn the rod to its initial position as soon as a shaft 28. Keyed to the shaft 28 is a pinion which is in mesh with the gear 24. Keyed to the shaft- 28 is a semieircular cam disk 30, this disk being preferably less' in diameter 'than the pinion 29 and arranged concentric therewith. Pivoted at one end to the side wall of the casing above the shaft 2S is anv` L shaped arm 31 one leg of which is held in abutting eontactwith the cam surface of the disk lliy a helical spring 32 which engages the leg between its pivot and point of contact with the cam disk as shown, and the other leg of which extends .approximately 'lhe free end of the L shaped um 1s advanced intoa notch 3i :t'ornied in 'the rod 13 when the curved surface of the cam bears against the secured leg of thi` L shaped arm and is re. "acted from the notch by the helical spring 3:2 when the fiatface of the cani bears against the secured leg. It is now clear that when the L shaped arm is engaged in the notch 34 the receiver hook cannot be depressed manually, but will be locked in its raised position until the fiatface of the cam advances into engagement with the L shaped arm as above described. struction` positively prevents the receiver hook being pulled down and a primary circuit. broken until a certain time has elapsed after the receiver is taken from the receiver hook, and during this space of time the telegraph mechanism which proclaims an auditor to the persons engaged in conversation will have operated.

T he telegraph mechanism consists of a disk 35 formed of wood, fiber or. other suitable insulating material and is provided centrally with a metal sleeve 36 which is rigidly secured to the shaft 28 and is insulated therefrom as shown at 3T. Secured to the-periphery of the disl 35 is a plurality of spaced plates v3&4, each disk being independently connected to the sleeve 36 by a wire 2S) which is preferably countersunk in the side face of the disk. Transversely disposed on each disk is a series of teeth 40, these teeth of sufficient, size to project considerably beyond the periphery of each yplate as may clearly be seen by referring to Fig. -Mounted within the casing are a pair of brush holders 41 of any preferred formy and projecting horizontally from ythese holders are a pair of brushes 42 one of which engages teeth 40 on the periphery of the disk, and the otherof which engages the sleeve 36. Wires 43 connect the brushes in parallel with the primary circuit of the telephone as shown in Fig. 1.,

Supposing now the telephone call to be one long dash, a short dash, and then another long dash, thus On the periphery of the disk 27 a long plate 44, a

p short plate 45 and another long plate 46 This confeach time the brush engages a tooth and broken each time the brush passes over the valleyv between adjacent teeth. It 1s clear g that while the brush is passing over the long Q plate a long series of makes and breaks in the circuit will occur, and while the brush y passes over the short plate a short series of makes and breaks will occur, the two series i being separated by a long break in the cirparallel with the bottom of the casing and is supported upon the latter by a guideplate cuit as the brush passes over the space on the periphery of thedisk between the two plates. r[he long series of breaks and makes will be repeated when the brush reaches the remaining long plate. It is well-known that In telephone constructlon every make and break in the circuit caused by a third part-y i breaking in on the line will be made audible to the persons engaged 1n conversation by a sharp click. This 1s )ust what occurs when the toothed plates rotate under the brushes, namely, a long series of clicks, a

shortseries of licks, then :mother long series df elicits-w ll be heard by both parties engaged in conversation when the telephone designated by the above-described call breaks in on the line.' 95 F or securing cvenness in the movement of `the disk 35 a balance wheel 4i' is mounted for rotation in the casing above the disk and is provided on its shaft with a pinion 4S that meshes with a gar-'ltl which is rigidly 100 secured to the shaft A pawl 50 secured to the bottom of the casing and engages the gear 49 thereby preventing the mechanism from rotating backward.

The guide plate 33 which supports the L 105 shaped locking arm on the bottom of the casing is provided with an upwardly inciined extension 51 which limits the downward movement of the link 2? so that the latter is maintained inposition to again engage the rod 19 when the latter returns to its lowest position of movement so that the trlegraphing mechanism is automatic in op,- eration and requires no attention from the operat or. `1 l 5 Frei. the foregoing description takt-n inronr -rt ion with the arcouq-ianying drawing, it is thought that the construction and operation of our invention will be easily understot-d without a more extended explanation, it being understood that various changes in `he minor details of construction may be mar i ithin the scope of the appended claim;A l A What is claimed is:

1. An attachment for telephones consisting of'an interrupting device connected with the telephone circuit, means connecting the device to th telephone receiver hook, and means to prevent the telephone circuit from 15a being opened until the interrupting device `has operated.

2. An attachment for telephones, consisting of anl interrupting device connected with `the telephone circuit, nxeaib' for operatively connecting the device to the telephone releeiver hook, antl locking means between the "-'reeeiver hook and device operating to prevent the telephone circuit from being opened until the interrupting device has operated.

3. An attachment for telephones, consist ing ofV a rotary interrupting element. connected in circuit with the telephone primalv circuit, means for rotating said interruptingr element, a movable nieinbcr assembled with -the telephone receiver hook tor actuating sant means. and locking means engaggjnrclr saitlznova'le member when the telephone receiver hook ris-:s for preventing said hook from being lowered to open the circuit be- 'ftn'etlle interruptingr element has operated. Y 4. An attachment; for telephones, compriswhen the receiver hook is raised to prevent` the said hook from being lowered until the luterrupter has operated.

In testimony whereof: we 'atlix our Dignatures in 'nesence of two Witnesses.

tlfiLL-Ann C. FISH. HARRY L. VVHITE. `Witnesses:

Enrrn CHANDLEe, Wg. M. CHANDLER. 

